What is the relationship between constellations and stars?

Centauri is one of the southern constellations. For observers in the southern hemisphere, Centauri is a constellation in autumn night, but in China, only a few southern provinces can see it in spring night. Located in the south of Ophiuchus and the north of the Southern Cross, between the compass, the wolf and Vela, its south is immersed in the bright galaxy. The two brightest stars in Centauri, South Gate 2 in yellow and Marbury 1 in white, are very close to each other, close to the compass. During Zheng He's seven voyages to the Western Ocean in14th century, they were used for navigation, and they were called "South Gate Twin Stars". The famous proxima centauri is located in Centauri, which is a sub-star of the triad star Nanmener and the closest star to our solar system. Constellation refers to the stars in the sky. In fact, the stars in the same constellation have no actual relationship with each other, but their projection positions on the celestial sphere are similar. Since ancient times, people have been interested in the arrangement and shape of stars, and naturally linked some stars with similar positions to form constellations. Constellations are divided into Polaris, South Star and Zodiac. The whole day is currently divided into 88 constellations. Constellations are generally named after musical instruments or Greek mythical figures.